DEFORMATION STYLE IN THE MUNSIARI THRUST DAMAGE ZONE (MCT-II) ALONG MADLAKIYA-MUN.SIARI SECTION, KUMAUN HIMALAYA

Abstract

The southern boundary of the Main Central Thrust zone, identified in the form of Munsiyari Thrust in the north-eastern Kumaon Himalaya, brings Higher Himalayan Crystallines (HHC) over the Tejam Sedimentaries of the Lesser Himalayas (LHS). Detailed mapping and structural analysis shows that the hanging wall and footwall rocks across the Munsiyari Thrust has been deformed by same deformation plan with two phases of folding and a later extensional deformation. Geometry of the Munsiyari Thrust shows a characteristic pattern which has been explained using fold or imbricate model. We find the folding of the Munsiyari Thrust as a more plausible explanation for the identified geometry of the thrust, with the thrust being folded and later modified by early and late folding events along the thrust.